It is amazing stuff. My whine decreased a lot after 3 hours of mowing.
I want to try it but @$12/qt it is too expensive for my budget. If I was doing commercial work definitely a YES, but being residential @30hrs/year it is difficult to justify the costs. Instead, I am going with NAPA sale 15W-50 synthetic $3/qt and adding Redline zddp to raise the Zn/P to 1200/1100 ppm. (Redline zddp 18g to 24g per quart). I added 18g
Amsoil 4qts =$48
NAPA + Redline zddp 4qts =$16 (1/3 the costs)
The kids need school shoes.